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examples/udhcp/simple.script: fix IPv6 support when using udhcpc

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The udhcpc script calls ip addr flush .. which flushes addresses
of any address family, including IPv6. However, busybox udhcpc is
IPv4 only and should not influence IPv6 addressing. Hence use ip
addr flush with family constraint.

The script particularly broke IPv6 SLAAC: Typically when udhcpc
calls the script the kernel already assigned the IPv6 link-local
address. The flush removes the link-local IPv6 address again and
prohibits proper IPv6 operation such as SLAAC since neighbor
discovery protocol relies on IPv6 link-local addressing.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
[Taken from https://git.openembedded.org/openembedded-core/commit/meta/recipes-core/busybox/files/simple.script?id=b77541dbb2f442e51842f9d24c8745a6df2d1478]
Signed-off-by: Quentin Schulz <quentin.schulz@streamunlimited.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Stefan Agner 2020-06-16 10:06:27 +02:00 committed by Denys Vlasenko
parent faab906d28
commit 62744efa47
1 changed files with 1 additions and 1 deletions
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examples/udhcp/simple.script
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@ -18,7 +18,7 @@ case "$1" in
deconfig) deconfig)
echo "Clearing IP addresses on $interface, upping it" echo "Clearing IP addresses on $interface, upping it"
if command -v ip >/dev/null; then if command -v ip >/dev/null; then
ip addr flush dev $interface ip -4 addr flush dev $interface
ip link set dev $interface up ip link set dev $interface up
else else
ifconfig $interface 0.0.0.0 ifconfig $interface 0.0.0.0